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VPC Question

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    Bowen Y
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VPC Question : can you have overlapping VPC CIDRs in AWS ?

You could, and it’s only an issue if you want to route traffic between them.

This is answer, "you can, but you shouldn't"

You'll probably one day want to connect two of these VPCs and it will be your biggest nightmare. Just assign different ranges to each VPC...

The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:

     10.0.0.0        -   10.255.255.255  (10/8 prefix)
     172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
     192.168.0.0     -   192.168.255.255 (192.168/16 prefix)